Abstract
This paper considers chaos in a PI control system for the first time and presents an equivalent-input-disturbance (EID)-based control method to suppress a chaotic phenomenon. Since the chaos is caused by two nonlinear terms, two EID estimators are used to separately compensate for them, and thus to suppress any possible chaos. This paper devises a new way to analyze the stability of the EID-based PMSM drive system and provides a stability region based on the concept of local uniformly boundedness. Simulation results show that the method is effective to suppress chaos for the PI control system. A comparison of the method with nonlinear feedback control, backstepping control, and impulsive control shows the superiority of our method.
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